Free practice test
CDL practice test Class B
A Class B CDL usually means two written tests: General Knowledge and Air Brakes. You need 80% on each one, so you pass or fail each test on its own.
FirstTry CDL is not affiliated with any DMV, FMCSA or government agency. Practice questions are exam-style questions built from the official CDL manual, not actual test questions.
Which written tests Class B needs
| Test | Why | Questions | To pass |
|---|---|---|---|
| General Knowledge | Everyone takes it. | 50 | 40 (80%) |
| Air Brakes | Needed if the vehicle you will drive has air brakes. Many Class B trucks and buses do. | 25 | 20 (80%) |
Add Passenger for a bus, School Bus for a school bus, Tanker for liquid loads and Hazmat for placarded loads.
Entry-level driver training is required before the skills test for first-time Class B applicants.
What Class B lets you drive
Single vehicles over 26,000 lbs, like dump trucks, box trucks, straight trucks and many buses. You may tow a trailer of 10,000 lbs or less.
This is a simplified summary. Your state's CDL manual has the exact weight rules.
Endorsements you can add
| Letter | Endorsement | What it covers |
|---|---|---|
| H | Hazardous Materials | Haul placarded hazardous materials. Needs a TSA background check. |
| N | Tanker | Haul liquids or gases in a tank. |
| P | Passenger | Drive a bus or other vehicle built for 16 or more people. |
| S | School Bus | Drive a school bus. Also needs the Passenger test. |
| T | Doubles/Triples | Pull two or three trailers. |
Common questions
Which written tests do I need for a Class B CDL?
Everyone takes General Knowledge. Class B usually adds Air Brakes, if the vehicle you will drive has air brakes. Add a test for each endorsement you want, like Passenger for a bus.
What can I drive with a Class B CDL?
Single vehicles over 26,000 lbs, like dump trucks, box trucks and many buses. You may tow a trailer of 10,000 lbs or less.
Is the Class B test easier than Class A?
It has fewer tests, because there is no Combination Vehicles test. The General Knowledge and Air Brakes tests are the same.
Do I need the Air Brakes test for Class B?
If you will take your skills test in a vehicle with air brakes, yes. Otherwise your license gets an air brake restriction.